I used to be pretty into rap until recently when the decline came and its all just talentless copies now, but if you take some of the old rap like like the 90s and below you get some really good stuff and I think they would go great with alot of animes I've seen. Post apocalyptic ghettos remind me of where I grew up and the rap I would listen to there and I always thing they should play some rap since it makes me so nostalgic.